useRouter with hash

[FrontLeejonghun]

When localePrefix is set to as-needed and routing is done with a hash attached, the hash disappears when the default locale is used.

However, when localePrefix is set to always, it works as expected.

Is there something I might be missing here?
I'm using version 4.3.9.

The reproduction steps are as follows:
When accessing with the defaultLocale, if you perform a router push or handle routing with the locale attached, the hash disappears.
However, if you explicitly remove the locale parameter from useRouter or Link, it works correctly.

There’s a chance the problem is coming from this section of the code (router-server.ts, lines 205–215). It might be good to double-check that part.

1. Clone the repository. Link
2. Run the project locally.
3. Open the index page (/).
4. Click “switch locale ko” to change to a non-default locale (e.g., ko).
5. Click “routerPushWithLocale” → works normally.
6. Click “routerPushWithoutLocale” → works normally.
7. Click “switch locale en” to change back to the default locale.
8. Click “routerPushWithLocale” → the hash (#hash=test) disappears.
9. Click “routerPushWithoutLocale” → works normally.